Digirig Mobile works fine at home but not when remote

I’ve been able to get Digirig-Mobile working fine with my Xiegu G90. I took my transceiver and laptop to a POTA activation, and the PC would not recognize the Digirig when I was in the park and away from Internet connectivity. The receiver’s output did not register in WSJT-X as it normally does.

I came back from the park and everything once again worked fine.

The only thing I did differently in the field is to plug the Digirig Mobile directly into a USB port on the PC; normally I plug it into a USB hub which is then connected to the PC.

Any suggestions would be appreciated! 73 - Richard KD3DGH